Ectophloic siphonostele is found in

• A

  Adiantum and Cucurbitaceae
• Correct answer
  B

  Osmunda and Equisetum
• C

  Marsilea and Botrychium
• D

  Dicksonia and maiden hair fern

Solution

In the ectophloic siphonostele the xylem surrounds pith and this xylem is surrounded by phloem, pericycle and endoderm is respectively. e.g., Osmunda and Equisetum.

Hence, the correct answer is option: 'B'.